As part of Road Trip 2015, CNET visits Mcity, a 32-acre fake city in Michigan designed to test self-driving cars' navigation and communication abilities -- and to keep research from migrating to Silicon Valley.

Road Trip 2015: The second half of a two-part series about Vietnam's startup scene takes a deeper look at some rare success stories and how the country is fostering -- and hindering -- its homegrown tech community.